The problem I am having with the trans is it sometimes shifts hard into 3rd gear when I have the rpms up and then its stuck there. Wont shift up or down just gets stuck in third gear???? I can still use park, reverse, and neutral. Obviously it throws a check engine light, not sure what codes. Last night it did it again so i pulled over and unplugged every wiring harness i could find off the trans and it started shifting fine again. Its an intermittent problem, seems to be fine as long as i keep the rpms down.

Anyone else every have this problem or know what may be causing it????

06Spec5...
You said "The problem I am having with the trans is it sometimes shifts hard into 3rd gear when I have the rpms up and then its stuck there"
How do you get the RPMs up? Manual shifting from 2nd to 3rd?
If so this car is not a "racing class" vehicle and doesn't like shifting outside of it's normal range (set by the TCM)...
How do I know? look at the cars I/We drive by my sig. They just don't like "manual" shifting. These automatic transmissions are not built for hard driving and nether is the car.
Dave

Oh...BTW....
Please read about Spectras trashing the engines when driving them with original timing/cam belts in the Spectra section of these forums. This belt MUST be replaced and associated components (tensioner,roller) checked and/or replaced EVERY 60k. Pushing the engine and tranny at 65k without replacing the belt is VERY DANGEROUS to your car and pocketbook.
Dave

I forgot i even posted this. Trans still getting stuck in third, not sure why, it just does it whenever it wants to. Just driving normally in "Drive" and all of the sudden it shifts HARD into third and stays there????? Usually it goes back to shifting normal when it has been off for a bit. It seems like it would have to be an electronics issue but im no expert on transmissions. Gonna change the oil in the trans this weekend, what type of oil do you recommend?

Some transmission DTCs will cause the trans to enter fail-safe mode when set. When this happens, the TCM commands full line pressure and locks the trans in 3rd gear. You need to find out what DTC is set and get it diagnosed.

06Spec5...
I agree with spongebob218... Sounds like the transmission control module believes there is a critical "error" and going into limp mode (3rd gear). It could be as simple as an oxidized connection going to the tranny. If the car runs fine most of the time it's probably something like the above. The fun part is locating what/why it is doing it.
A code reader may pull up some transmission codes that may point in the direction to what may be failing.
The transmission fluid is best bought at the KIA dealership as you don't want to put the wrong type in and "car parts" stores have been known to suggest the wrong type. The dealer should have it in quarts with either Hyundai or KIA part number.
Saving $2~$3 a can could cost you your tranny...just not worth it.
Dave